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7f33b09c65
Linux-specific code that is required for maintaining ABI compatibility.
This doesn't contain the actual system call interface, that is split out
in order to avoid having a patch that's too big.
2018-01-29 Palmer Dabbelt <palmer@sifive.com>
* sysdeps/riscv/nptl/pthread-offsets.h: New file.
* sysdeps/riscv/nptl/pthreaddef.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/bits/fcntl.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/bits/mman.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/dl-cache.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/getcontext.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/makecontext.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/readelflib.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/register-dump.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/setcontext.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/swapcontext.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/sys/cachectl.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/sys/procfs.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/sys/ucontext.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/sys/user.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/ucontext-macros.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/ucontext_i.sym: Likewise.
126 lines
3.5 KiB
ArmAsm
126 lines
3.5 KiB
ArmAsm
/* Save and set current context.
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Copyright (C) 2009-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "ucontext-macros.h"
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/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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LEAF (__swapcontext)
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mv t0, a1 /* Save ucp into t0. */
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SAVE_INT_REG (ra, 0, a0)
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SAVE_INT_REG (ra, 1, a0)
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SAVE_INT_REG (sp, 2, a0)
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SAVE_INT_REG (s0, 8, a0)
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SAVE_INT_REG (s1, 9, a0)
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SAVE_INT_REG (x0, 10, a0) /* return 0 by overwriting a0. */
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SAVE_INT_REG (s2, 18, a0)
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SAVE_INT_REG (s3, 19, a0)
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SAVE_INT_REG (s4, 20, a0)
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SAVE_INT_REG (s5, 21, a0)
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SAVE_INT_REG (s6, 22, a0)
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SAVE_INT_REG (s7, 23, a0)
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SAVE_INT_REG (s8, 24, a0)
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SAVE_INT_REG (s9, 25, a0)
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SAVE_INT_REG (s10, 26, a0)
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SAVE_INT_REG (s11, 27, a0)
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#ifndef __riscv_float_abi_soft
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frsr a1
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SAVE_FP_REG (fs0, 8, a0)
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SAVE_FP_REG (fs1, 9, a0)
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SAVE_FP_REG (fs2, 18, a0)
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SAVE_FP_REG (fs3, 19, a0)
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SAVE_FP_REG (fs4, 20, a0)
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SAVE_FP_REG (fs5, 21, a0)
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SAVE_FP_REG (fs6, 22, a0)
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SAVE_FP_REG (fs7, 23, a0)
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SAVE_FP_REG (fs8, 24, a0)
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SAVE_FP_REG (fs9, 25, a0)
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SAVE_FP_REG (fs10, 26, a0)
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SAVE_FP_REG (fs11, 27, a0)
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sw a1, MCONTEXT_FSR(a0)
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#endif /* __riscv_float_abi_soft */
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
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li a3, _NSIG8
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add a2, a0, UCONTEXT_SIGMASK
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add a1, t0, UCONTEXT_SIGMASK
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li a0, SIG_SETMASK
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li a7, SYS_ify (rt_sigprocmask)
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scall
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bltz a0, 99f
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#ifndef __riscv_float_abi_soft
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lw t1, MCONTEXT_FSR(t0)
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RESTORE_FP_REG (fs0, 8, t0)
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RESTORE_FP_REG (fs1, 9, t0)
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RESTORE_FP_REG (fs2, 18, t0)
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RESTORE_FP_REG (fs3, 19, t0)
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RESTORE_FP_REG (fs4, 20, t0)
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RESTORE_FP_REG (fs5, 21, t0)
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RESTORE_FP_REG (fs6, 22, t0)
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RESTORE_FP_REG (fs7, 23, t0)
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RESTORE_FP_REG (fs8, 24, t0)
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RESTORE_FP_REG (fs9, 25, t0)
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RESTORE_FP_REG (fs10, 26, t0)
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RESTORE_FP_REG (fs11, 27, t0)
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fssr t1
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#endif /* __riscv_float_abi_soft */
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/* Note the contents of argument registers will be random
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unless makecontext() has been called. */
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RESTORE_INT_REG (t1, 0, t0)
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RESTORE_INT_REG (ra, 1, t0)
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RESTORE_INT_REG (sp, 2, t0)
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RESTORE_INT_REG (s0, 8, t0)
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RESTORE_INT_REG (s1, 9, t0)
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RESTORE_INT_REG (a0, 10, t0)
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RESTORE_INT_REG (a1, 11, t0)
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RESTORE_INT_REG (a2, 12, t0)
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RESTORE_INT_REG (a3, 13, t0)
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RESTORE_INT_REG (a4, 14, t0)
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RESTORE_INT_REG (a5, 15, t0)
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RESTORE_INT_REG (a6, 16, t0)
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RESTORE_INT_REG (a7, 17, t0)
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RESTORE_INT_REG (s2, 18, t0)
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RESTORE_INT_REG (s3, 19, t0)
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RESTORE_INT_REG (s4, 20, t0)
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RESTORE_INT_REG (s5, 21, t0)
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RESTORE_INT_REG (s6, 22, t0)
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RESTORE_INT_REG (s7, 23, t0)
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RESTORE_INT_REG (s8, 24, t0)
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RESTORE_INT_REG (s9, 25, t0)
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RESTORE_INT_REG (s10, 26, t0)
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RESTORE_INT_REG (s11, 27, t0)
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jr t1
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99: j __syscall_error
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PSEUDO_END (__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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